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serval-dna/uri.c
Andrew Bettison 41b3e304be Updated some copyright messages and COPYRIGHT.txt
2016-10-13 16:23:18 +10:30

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/*
Serval URI primitives
Copyright (C) 2015 Serval Project Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "uri.h"
#include "str.h"
#include <ctype.h>
#include <stdlib.h> // for atoi()
#include <sys/uio.h> // for iovec
#include <limits.h> // for USHRT_MAX
#include <assert.h>
static size_t _uri_encodev(int www_form, char *const dstUrienc, ssize_t dstsiz, struct iovec ** iovp, int *iovcntp)
{
char * dst = dstUrienc;
char * const dstend = dstUrienc + dstsiz;
while (*iovcntp && (dstsiz == -1 || dst < dstend)) {
if ((*iovp)->iov_len == 0) {
--*iovcntp;
++*iovp;
} else {
unsigned char c = *(unsigned char *)(*iovp)->iov_base;
if (www_form && c == ' ') {
if (dstUrienc)
*dst = '+';
++dst;
} else if (is_uri_char_unreserved(c)) {
if (dstUrienc)
*dst = c;
++dst;
} else if (dst + 3 <= dstend) {
if (dstUrienc) {
dst[0] = '%';
dst[1] = hexdigit_upper[c & 0xf];
dst[2] = hexdigit_upper[c >> 4];
}
dst += 3;
} else {
break;
}
++(*iovp)->iov_base;
--(*iovp)->iov_len;
}
}
return dst - dstUrienc;
}
static size_t _uri_encode(int www_form, char *const dstUrienc, ssize_t dstsiz, const char *src, size_t srclen, const char **afterp)
{
struct iovec _iov;
_iov.iov_base = (void *) src;
_iov.iov_len = srclen;
struct iovec *iov = &_iov;
int ioc = 1;
size_t encoded = _uri_encodev(www_form, dstUrienc, dstsiz, &iov, &ioc);
if (afterp)
*afterp = _iov.iov_base;
return encoded;
}
size_t uri_encode(char *const dstUrienc, ssize_t dstsiz, const char *src, size_t srclen, const char **afterp)
{
return _uri_encode(0, dstUrienc, dstsiz, src, srclen, afterp);
}
size_t www_form_uri_encode(char *const dstUrienc, ssize_t dstsiz, const char *src, size_t srclen, const char **afterp)
{
return _uri_encode(1, dstUrienc, dstsiz, src, srclen, afterp);
}
size_t uri_encodev(char *const dstUrienc, ssize_t dstsiz, struct iovec ** iovp, int *iovcntp)
{
return _uri_encodev(0, dstUrienc, dstsiz, iovp, iovcntp);
}
size_t www_form_uri_encodev(char *const dstUrienc, ssize_t dstsiz, struct iovec ** iovp, int *iovcntp)
{
return _uri_encodev(1, dstUrienc, dstsiz, iovp, iovcntp);
}
static size_t _uri_decode(int www_form, char *const dstOrig, ssize_t dstsiz, const char *srcUrienc, size_t srclen, const char **afterp)
{
char *dst = dstOrig;
char *const dstend = dst + dstsiz;
while (srclen && (dstsiz == -1 || dst < dstend)) {
if (www_form && *srcUrienc == '+') {
if (dstOrig)
*dst = ' ';
++srcUrienc;
--srclen;
} else if (srclen >= 3 && srcUrienc[0] == '%' && isxdigit(srcUrienc[1]) && isxdigit(srcUrienc[2])) {
if (dstOrig)
*dst = (hexvalue(srcUrienc[1]) << 4) + hexvalue(srcUrienc[2]);
srcUrienc += 3;
srclen -= 3;
} else {
if (dstOrig)
*dst = *srcUrienc;
++srcUrienc;
--srclen;
}
++dst;
}
if (afterp)
*afterp = srcUrienc;
return dst - dstOrig;
}
size_t uri_decode(char *const dst, ssize_t dstsiz, const char *srcUrienc, size_t srclen, const char **afterp)
{
return _uri_decode(0, dst, dstsiz, srcUrienc, srclen, afterp);
}
size_t www_form_uri_decode(char *const dst, ssize_t dstsiz, const char *srcUrienc, size_t srclen, const char **afterp)
{
return _uri_decode(1, dst, dstsiz, srcUrienc, srclen, afterp);
}
/* Return true if the string resembles a URI.
* Based on RFC-3986 generic syntax, assuming nothing about the hierarchical part.
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int str_is_uri(const char *uri)
{
const char *p;
size_t len;
if (!str_uri_scheme(uri, &p, &len))
return 0;
const char *const q = (p += len + 1);
for (; *p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#'; ++p)
;
if (p == q)
return 0;
if (*p == '?')
for (++p; *p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#'; ++p)
;
if (*p == '#')
for (++p; *p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#'; ++p)
;
return !*p;
}
int str_is_uri_scheme(const char *scheme)
{
if (!isalpha(*scheme++))
return 0;
while (is_uri_char_scheme(*scheme))
++scheme;
return *scheme == '\0';
}
int str_uri_scheme(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
// Scheme is ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
if (!isalpha(*p++))
return 0;
while (is_uri_char_scheme(*p))
++p;
// Scheme is followed by colon ":".
if (*p != ':')
return 0;
if (partp)
*partp = uri;
if (lenp)
*lenp = p - uri;
return 1;
}
int str_uri_hierarchical(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
while (*p && *p != ':')
++p;
if (*p != ':')
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#')
++p;
if (p == q)
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_query(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
while (*p && *p != '?')
++p;
if (*p != '?')
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '#')
++p;
if (p == q || (*p && *p != '#'))
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_fragment(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
while (*p && *p != '#')
++p;
if (*p != '#')
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)))
++p;
if (p == q || *p)
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_hierarchical_authority(const char *hier, const char **partp, size_t *lenp)
{
if (hier[0] != '/' || hier[1] != '/')
return 0;
const char *const q = hier + 2;
const char *p = q;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '/' && *p != '?' && *p != '#')
++p;
if (p == q || (*p && *p != '/' && *p != '?' && *p != '#'))
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_hierarchical_path(const char *hier, const char **partp, size_t *lenp)
{
if (hier[0] != '/' || hier[1] != '/')
return 0;
const char *p = hier + 2;
while (*p && *p != '/' && *p != '?' && *p != '#')
++p;
if (!*p)
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '/' && *p != '?' && *p != '#')
++p;
if (p == q || (*p && *p != '/' && *p != '?' && *p != '#'))
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_authority_username(const char *auth, const char **partp, size_t *lenp)
{
const char *p;
for (p = auth; *p && *p != '@' && *p != '/' && *p != '?' && *p != '#'; ++p)
;
if (*p != '@')
return 0;
for (p = auth; *p && *p != ':' && *p != '@'; ++p)
;
if (*p != ':')
return 0;
if (partp)
*partp = auth;
if (lenp)
*lenp = p - auth;
return 1;
}
int str_uri_authority_password(const char *auth, const char **partp, size_t *lenp)
{
const char *p;
for (p = auth; *p && *p != '@' && *p != '/' && *p != '?' && *p != '#'; ++p)
;
if (*p != '@')
return 0;
for (p = auth; *p && *p != ':' && *p != '@'; ++p)
;
if (*p != ':')
return 0;
const char *const q = ++p;
for (; *p && *p != '@'; ++p)
;
assert(*p == '@');
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_authority_hostname(const char *auth, const char **partp, size_t *lenp)
{
const char *p;
const char *q = auth;
for (p = auth; *p && *p != '/' && *p != '?' && *p != '#'; ++p)
if (*p == '@')
q = p + 1;
const char *r = p;
while (r > q && isdigit(*--r))
;
if (r < p - 1 && *r == ':')
p = r;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_authority_port(const char *auth, uint16_t *portp)
{
const char *p;
const char *q = auth;
for (p = auth; *p && *p != '/' && *p != '?' && *p != '#'; ++p)
if (*p == '@')
q = p + 1;
const char *r = p;
while (r > q && isdigit(*--r))
;
if (r < p - 1 && *r == ':') {
for (++r; *r == '0'; ++r)
;
unsigned int n;
if (p - r <= 5 && (n = atoi(r)) <= USHRT_MAX) {
*portp = n;
return 1;
}
}
return 0;
}
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